docs: def fulltext_add(self, index, docs):
          """
          Adds documents to the search index.
          """
          xml = Document()
          root = xml.createElement('add')
          for doc in docs:
              doc_element = xml.createElement('doc')
              for key in doc:
                  value = doc[key]
                  field = xml.createElement('field')
                  field.setAttribute("name", key)
                  text = xml.createTextNode(value)
                  field.appendChild(text)
                  doc_element.appendChild(field)
              root.appendChild(doc_element)
          xml.appendChild(root)
  
          self._request('POST', self.solr_update_path(index),
                        {'Content-Type': 'text/xml'},
                        xml.toxml().encode('utf-8'))